In order for us to see the lens must accomodate both distance and near vision. It does this by changing shape using ciiliary muscles. The ciliary muscle ___________ for distance vision and __________ for near vision.

relaxes, contracts

Rods absorp light and ________ splits into _________ and ___________.

opsin, retinal

Rods see __________________..

Black and White

________ vision is dependent on three kinds of _________

Color, cones

Color blindnesss is caused by

inherited absence of color pigments in the cones.

choriod layer _______________________

regulates the size of the pupil.

The colored portion of the eyes is

the iris

Three types of cones, ______, ________ and ______

red, green, blue

_______ a disk where no ______ are present but the greatest concentration of __________.

rods, cones

The fluid in front of the lens is the

aqueous humor

Behind the lense is the _________

vitreous humor

Information from the eye is processed in the _______ of the brain.

cerebral cortex

Optic nerve carries the signal to the ________

optic chiasma

Fibers from the optic tracts neurons in the ________.

thalmus

The ear contains the sense of _______ and ________

hearing, balance or equilibrium

The receptors in the ear are _________.

mechanorecepters.

The external ear is called the _____

auricle or pinna

The role of the auricle is

collect and funnel information

The _____ separates the external ear from the middle ear.

tympanic membrane.

three bones of the middle ear the _____, the ____ and the ______.

mallus, incas, stapes

The role of the middle ear is to

amplify the sound collected by the outer ear.

The ____ separates the middle ear from the inner ear

oval window.

The ______ connects the middle ear to the throat

eustachian tube

Three areas of the inner ear

the semicircular canal, vestibules, cochlea

Sense of hearing takes place in the ___________

cochlea

sense of balance takes place in the ____________ and _____

vestibules and semicircular canal.

Within the cochlea tiny hairs serve as the mechanorecepter known as the _____

Organ of Corti

Sense of balance is controled by the _____ located in the ______

cristae ampularis, semicircular canal.

Sound travels by _________

vibration of air molecules

tiny hairs that vibrate inside the Organ of Corti that allow us to sense sound are called

steriocilia

Mechanoreceptors within the semicircular canal are responsible for _________

rotational equilibrium

Mechanoreceptors within the vestibules are responsible for

gravitational equilibrium

Cataracts are caused by

clouding of the lense due to inadequate drainage of aqueous humor.

Age related macular degeneration is caused by

degeneration of the macula of the eye. loses the fine tuning of the sense of sight.

Glaucoma is

increase of intraocular pressure in the eye because of blockage of blood vessels in the eye.